The effects of drop size and formulation upon the spread of pesticide droplets impacting on water‐sensitive papers |
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| Authors: | J R M Thacker F R Hall |
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| Institution: | Laboratory for Pest Control Application Technology , The Ohio State University, Ohio Agricultural Research and Development Center , Wooster, Ohio, 44691–4096, USA |
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| Abstract: | Abstract The effects of drop size and formulation upon the spread of pesticide droplets impacting on water‐sensitive papers (WSPs) was investigated. Droplets of diameter 70–350 μm, of four permethrin formulations, were produced using a monosize droplet generator. The droplets were collected on WSPs and in Dow Corning fluid and their diameters measured using a binocular microscope. Spread factors, upon the WSPs, for each dropsize/formulation combination were then calculated. Spread factors varied with both formulation and droplet size and for droplets of 200 and 300 μm diameter spread was significantly correlated with the dynamic surface tension of the formulation. The results suggest that proper calibration of WSPs is necessary for effective droplet sizing. |
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| Keywords: | water‐sensitive paper spread factor pesticide formulation drop size |
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